How to check record if exists before insert with PostgreSQL?

I have a record:

insert into posts(id, title, body) values(1, 'First post', 'Awesome');

If the First post title and Awesome body already exist in the db, I want to ignore it.

When create a table, it's possible to use IF NOT EXISTS syntax. For inserting, is there an easy way?

if you create a unique key constraint on title & body columns, you can use insert statement as below to ignore if record already exists

insert into posts(id, title, body) values (1, 'First post', 'Awesome') on conflict (title, body) do nothing;

StackExchange Database Administrators Q#316319, answer score: 3